Bump Map & Escape Planning: Worked Example

Worked example

Worked Example for Bump Map & Escape Planning focuses on bump congestion, reroute churn, escape DRC violations. The goal is to map symptoms to boundary contracts, owner actions, and regression-proof closure.

A review detects bump congestion, reroute churn, escape DRC violations. Strong analysis starts by freezing baseline and proving where the first boundary failed in Bump Map & Escape Planning.

Sequence under inspection

SOC INTEGRATION FLOW — Bump Map & Escape Planning

requirements + budgets
        |
        v
IP handoff + collateral check
        |
        v
integration build + bring-up smoke
        |
        v
cross-domain signoff evidence
        |
        v
tapeout readiness decision

Metric in focus: bump congestion, reroute churn, escape DRC violations

Bump escape planning

BUMP + ESCAPE

die bumps -> redistribution -> package balls
      |             |
   power grid    high-speed lane escape

Early escape planning prevents late route deadlock.

1. Capture failing artifact and manifest tags.

2. Map failure to one owner boundary.

3. Verify mechanism using one reduced repro.

4. Compare against bump map revision, escape routing plan, package feasibility report.

5. Select one reversible fix and define full regression upfront.

Did the fix work?

BEFORE / AFTER FIX — Bump Map & Escape Planning

risk index
 0 |                    --- target
40 |    ● regression
65 |         ● before fix
20 |              ● after fix
    +-------------------------------> iteration
Always verify collateral, regression suite, and owner signoff.

SoC deep dive

Package assumptions must be treated as first-class chip constraints.

Concept diagram

PACKAGE CO-DESIGN
die io <-> package routing <-> board constraints

Metric graph

PACKAGE RISK MIX
SI margin █████
power integrity ████
lane mapping ███

Reports and artifacts

• bump map revision log

• SI/PI margin report

• IO co-design checklist

• package bring-up failures

Mini case study

Link degradation on product board came from package routing assumptions not reflected in pre-silicon model.

Debug branches

• Compare package model versions

• Audit lane mapping

• Correlate SI/PI margins to failures

Senior review question

Ask: what baseline, owner, and artifact prove this topic is truly closed?

Key takeaways

• State baseline manifest and owner with every closure metric.

• Run cross-domain regression after every top-level fix.

Common pitfalls

• Comparing results across different manifests.

• Unowned issues slipping through review cycles.

• Waiving risks without expiry and validation plan.

Principal SoC review addendum

Bump maps and escape strategy determine routability, IR quality, and package feasibility before final pad-ring freeze.

Metric: bump congestion, reroute churn, escape DRC violations